diff --git a/crt/aws-checksums b/crt/aws-checksums
index 9978ba2c3..270b15acc 160000
--- a/crt/aws-checksums
+++ b/crt/aws-checksums
@@ -1 +1 @@
-Subproject commit 9978ba2c33a7a259c1a6bd0f62abe26827d03b85
+Subproject commit 270b15acc1b2125340ec1c6dda6cc3c28ef0fa44
diff --git a/include/aws/crt/checksum/CRC.h b/include/aws/crt/checksum/CRC.h
index 023d1d21a..e59b4d506 100644
--- a/include/aws/crt/checksum/CRC.h
+++ b/include/aws/crt/checksum/CRC.h
@@ -34,6 +34,21 @@ namespace Aws
              * the non bit-reflected polynomial 0xad93d23594c93659) and inverts the CRC input and output bits.
              */
             uint64_t AWS_CRT_CPP_API ComputeCRC64NVME(ByteCursor input, uint64_t previousCRC64NVME = 0) noexcept;
+
+            /**
+             * Combines two CRC32 (Ethernet, gzip) checksums computed over separate data blocks.
+             */
+            uint32_t AWS_CRT_CPP_API CombineCRC32(uint32_t crc1, uint32_t crc2, uint64_t len2) noexcept;
+
+            /**
+             * Combines two CRC32C (Castagnoli, iSCSI) checksums computed over separate data blocks.
+             */
+            uint32_t AWS_CRT_CPP_API CombineCRC32C(uint32_t crc1, uint32_t crc2, uint64_t len2) noexcept;
+
+            /**
+             * Combines two CRC64-NVME checksums computed over separate data blocks.
+             */
+            uint64_t AWS_CRT_CPP_API CombineCRC64NVME(uint64_t crc1, uint64_t crc2, uint64_t len2) noexcept;
         } // namespace Checksum
     } // namespace Crt
 } // namespace Aws
diff --git a/source/checksum/CRC.cpp b/source/checksum/CRC.cpp
index 65ed70e28..5ff65b251 100644
--- a/source/checksum/CRC.cpp
+++ b/source/checksum/CRC.cpp
@@ -27,6 +27,21 @@ namespace Aws
                 return aws_checksums_crc64nvme_ex(input.ptr, input.len, previousCRC64NVME);
             }
 
+            uint32_t CombineCRC32(uint32_t crc1, uint32_t crc2, uint64_t len2) noexcept
+            {
+                return aws_checksums_crc32_combine(crc1, crc2, len2);
+            }
+
+            uint32_t CombineCRC32C(uint32_t crc1, uint32_t crc2, uint64_t len2) noexcept
+            {
+                return aws_checksums_crc32c_combine(crc1, crc2, len2);
+            }
+
+            uint64_t CombineCRC64NVME(uint64_t crc1, uint64_t crc2, uint64_t len2) noexcept
+            {
+                return aws_checksums_crc64nvme_combine(crc1, crc2, len2);
+            }
+
         } // namespace Checksum
     } // namespace Crt
 } // namespace Aws